[Bug c/61271] New: 3 * possible coding error with logical not (!)

[Bug c/61271] New: 3 * possible coding error with logical not (!)

[dcb314 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61271

            Bug ID: 61271
           Summary: 3 * possible coding error with logical not (!)
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com

I just compiled gcc trunk 20140521 with boot compiler clang++ -g -O2 -Wall
and it said

1.

../../src/trunk/gcc/cgraphunit.c:1182:8: warning: logical not is only applied
to the left hand side of this comparison [-Wlogical-not-parentheses]

Source code is

      && (! TREE_CODE (target_node->decl) == FUNCTION_DECL

Maybe

      && (TREE_CODE (target_node->decl) != FUNCTION_DECL)

was intended.

2.

../../src/trunk/gcc/config/i386/i386.c:37905:10: warning: logical not is only
applied to the left hand side of this comparison [-Wlogical-not-parentheses]

Source code is

           || (!GET_CODE (x) != LABEL_REF

Confusing with the double negative. Maybe

           || (GET_CODE (x) == LABEL_REF

was intended.

3.

../../src/trunk/gcc/cp/cp-array-notation.c:1420:7: warning: logical not is only
applied to the left hand side of this comparison [-Wlogical-not-parentheses]

Source code is

  if (!TREE_CODE (type) == FUNCTION_TYPE)
    {
      error_at (loc, "array notation cannot be used with function type");
      return false;
    }

Maybe

  if (TREE_CODE (type) == FUNCTION_TYPE)
    {
      error_at (loc, "array notation cannot be used with function type");
      return false;
    }

was intended.

[Bug c/61271] 3 * possible coding error with logical not (!)

[dcb314 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61271

--- Comment #1 from David Binderman <dcb314 at hotmail dot com> ---
Some more:

4.

trunk/gcc/expr.c:10660:10: warning: logical not is only applied to the left
hand side of this comparison [-Wlogical-not-parentheses]

Source code

      || !exact_log2 (tree_to_uhwi (TREE_OPERAND (offset, 1)) + 1) < 0)

Maybe

      || exact_log2 (tree_to_uhwi (TREE_OPERAND (offset, 1)) + 1) >= 0)

5.

trunk/gcc/ipa-devirt.c:1122:11: warning: logical not is only applied to the
left hand side of this comparison [-Wlogical-not-parentheses]

Source code is

          || !tree_to_shwi (TYPE_SIZE (subtype)) <= 0)

Maybe

          || tree_to_shwi (TYPE_SIZE (subtype)) > 0)

6.

trunk/gcc/ira-color.c:3851:9: warning: logical not is only applied to the left
hand side of this comparison [-Wlogical-not-parentheses]

Source code is

        || !FRAME_GROWS_DOWNWARD == STACK_GROWS_DOWNWARD ? diff : -diff);

Maybe

        || ((FRAME_GROWS_DOWNWARD != STACK_GROWS_DOWNWARD) ? diff : -diff));

[Bug c/61271] 6 * possible coding error with logical not (!)

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61271

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-05-21
     Ever confirmed|0                           |1

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
yikes

[Bug c/61271] 6 * possible coding error with logical not (!)

[dcb314 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61271

--- Comment #3 from David Binderman <dcb314 at hotmail dot com> ---
Even more:

7.

src/trunk/gcc/lra-spills.c:240:9: warning: logical not is only applied to the
left hand side of this comparison [-Wlogical-not-parentheses]

Source code is

        || !FRAME_GROWS_DOWNWARD == STACK_GROWS_DOWNWARD ? diff : -diff);

Looks like #6

8.

trunk/gcc/sel-sched-ir.c:6189:30: warning: logical not is only applied to the
left hand side of this comparison [-Wlogical-not-parentheses]

Source code is

      if (bb->loop_father && !bb->loop_father->num == 0

Maybe

      if (bb->loop_father && bb->loop_father->num != 0

9.

trunk/gcc/tree-vect-data-refs.c:1833:11: warning: logical not is only applied
to the left hand side of this comparison [-Wlogical-not-parentheses]

Source code is

      if (!LOOP_REQUIRES_VERSIONING_FOR_ALIGNMENT (loop_vinfo))

but

#define LOOP_REQUIRES_VERSIONING_FOR_ALIGNMENT(L) \
  (L)->may_misalign_stmts.length () > 0

Maybe 

#define LOOP_REQUIRES_VERSIONING_FOR_ALIGNMENT(L) \
  ((L)->may_misalign_stmts.length () > 0)

might fix the problem.

10.

trunk/gcc/tree-vect-loop.c:1795:14: warning: logical not is only applied to the
left hand side of this comparison [-Wlogical-not-parentheses]
trunk/gcc/tree-vect-loop.c:1796:17: warning: logical not is only applied to the
left hand side of this comparison [-Wlogical-not-parentheses]

Source code is

           && ((!LOOP_REQUIRES_VERSIONING_FOR_ALIAS (loop_vinfo)
                && !LOOP_REQUIRES_VERSIONING_FOR_ALIGNMENT (loop_vinfo))


Maybe something like

#define LOOP_REQUIRES_VERSIONING_FOR_ALIAS(L)     \
  ((L)->may_alias_ddrs.length () > 0)

might solve the problem.

[Bug c/61271] 10 * possible coding error with logical not (!)

[manu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61271

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |manu at gcc dot gnu.org

--- Comment #5 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
I'm almost tempted to check svn blame to see who wrote these... a fair acto of
contrition would be to implement the warning for GCC. ;-)
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/61276] warn about possible coding errors with logical not (!)
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ida276

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-05-21
     Ever confirmed|0                           |1

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Patch for this one at https://gcc.gnu.org/ml/gcc-patches/2014-05/msg01792.html

[Bug c/61271] 10 * possible coding error with logical not (!)

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61271

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Thu May 22 12:17:15 2014
New Revision: 210804

URL: http://gcc.gnu.org/viewcvs?rev=210804&root=gcc&view=rev
Log:
cp:
    PR c/61271
    * cp-array-notation.c (cilkplus_an_triplet_types_ok_p): Fix condition.

testsuite:
    PR c/61271
    * g++.dg/cilk-plus/AN/array_function.cc: New.

Added:
    trunk/gcc/testsuite/g++.dg/cilk-plus/AN/array_function.cc
Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/cp-array-notation.c
    trunk/gcc/testsuite/ChangeLog

[Bug c/61271] 10 * possible coding error with logical not (!)

[uros at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61271

--- Comment #9 from uros at gcc dot gnu.org ---
Author: uros
Date: Mon May 26 17:33:09 2014
New Revision: 210937

URL: http://gcc.gnu.org/viewcvs?rev=210937&root=gcc&view=rev
Log:
    PR target/61271
    * config/i386/i386.c (ix86_rtx_costs)
    <case CONST_INT, case CONST, case LABEL_REF, case SYMBOL_REF>:
    Fix condition.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386.c

[Bug c/61271] 10 * possible coding error with logical not (!)

[uros at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61271

--- Comment #10 from uros at gcc dot gnu.org ---
Author: uros
Date: Thu May 29 08:15:40 2014
New Revision: 211046

URL: http://gcc.gnu.org/viewcvs?rev=211046&root=gcc&view=rev
Log:
    Backport from mainline
    2014-05-26  Uros Bizjak  <ubizjak@gmail.com>

    PR target/61271
    * config/i386/i386.c (ix86_rtx_costs)
    <case CONST_INT, case CONST, case LABEL_REF, case SYMBOL_REF>:
    Fix condition.


Modified:
    branches/gcc-4_9-branch/gcc/ChangeLog
    branches/gcc-4_9-branch/gcc/config/i386/i386.c

[Bug c/61271] 10 * possible coding error with logical not (!)

[manu at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61271

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Blocks|61276                       |49706

--- Comment #11 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
Bugzilla should learn to update the blocking list when marking duplicates.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61407

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |manu at gcc dot gnu.org

--- Comment #4 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #2)
> (In reply to Andrew Pinski from comment #1)
> > Looks like the Mac OS X's headers are not C99/C++98 compatible at all:
> > 
> > /Applications/Xcode6-Beta.app/Contents/Developer/Platforms/MacOSX.platform/
> > Developer/SDKs/MacOSX10.10.sdk/usr/include/Availability.h:174:44: error:
> > missing binary operator before token "("
> >  #if defined(__has_feature) &&
> > __has_feature(attribute_availability_with_message)
> >                                             ^
> 
> This error is correct because with the preprocessor && does not short
> cutting if the first operand is true.

If this is true, it sucks. Short-cutting simplifies writing such conditions.

But then the CPP manual is wrong:

https://gcc.gnu.org/onlinedocs/gcc-4.9.0/cpp/If.html#If

"Arithmetic operators for addition, subtraction, multiplication, division,
bitwise operations, shifts, comparisons, and logical operations (&& and ||).
The latter two obey the usual short-circuiting rules of standard C. "
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ida320

--- Comment #22 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> ---
> --- Comment #21 from Thomas Preud'homme <thomas.preudhomme at arm dot com> ---
> (In reply to ro@CeBiTec.Uni-Bielefeld.DE from comment #19)
>>
>> I've now regtested that patch on sparc-sun-solaris2.11 (compared to a
>> bootstrap without java before) and i386-pc-solaris2.11.  No regressions,
>> but gcc.c-torture/execute/bswap-2.c is still failing on sparc.
>
> There is a patch for bswap-2.c ready [0]. I'm just waiting for Andreas to
> confirm me it works for him on m68k. I'd be interested in knowing if that
> solves your issue as well.
>
> [0] https://gcc.gnu.org/ml/gcc-patches/2014-05/msg02519.html

I'm giving both patches combined a try right now, though SPARC bootstrap
will take 7+ hours to complete.

Please remember to add proposed patches to the URL field of the PR,
otherwise they are easily overlooked.

Thanks.
        Rainer

[Bug c/61271] 10 * possible coding error with logical not (!)

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61271

--- Comment #12 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Tue Aug 19 11:35:39 2014
New Revision: 214142

URL: https://gcc.gnu.org/viewcvs?rev=214142&root=gcc&view=rev
Log:
    PR c/61271
    * cgraphunit.c (handle_alias_pairs): Fix condition.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/cgraphunit.c

[Bug c/61271] 10 * possible coding error with logical not (!)

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61271

--- Comment #13 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Fri Aug 22 19:40:28 2014
New Revision: 214359

URL: https://gcc.gnu.org/viewcvs?rev=214359&root=gcc&view=rev
Log:
    PR c/61271
    * ira-color.c (coalesced_pseudo_reg_slot_compare): Wrap LHS of
    a comparison in parens.
    * lra-spills.c (pseudo_reg_slot_compare): Wrap LHS of a comparison
    in parens.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/ira-color.c
    trunk/gcc/lra-spills.c

[Bug c/61271] 10 * possible coding error with logical not (!)

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61271

--- Comment #14 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Tue Aug 26 09:21:18 2014
New Revision: 214493

URL: https://gcc.gnu.org/viewcvs?rev=214493&root=gcc&view=rev
Log:
    PR c/61271
    * tree-vectorizer.h (LOOP_REQUIRES_VERSIONING_FOR_ALIGNMENT,
    LOOP_REQUIRES_VERSIONING_FOR_ALIAS): Wrap in parens.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/tree-vectorizer.h

[Bug c/61271] 10 * possible coding error with logical not (!)

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61271

--- Comment #15 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Tue Aug 26 09:25:37 2014
New Revision: 214494

URL: https://gcc.gnu.org/viewcvs?rev=214494&root=gcc&view=rev
Log:
    PR c/61271
    * tree-vectorizer.h (LOOP_REQUIRES_VERSIONING_FOR_ALIGNMENT,
    LOOP_REQUIRES_VERSIONING_FOR_ALIAS): Wrap in parens.

Modified:
    branches/gcc-4_9-branch/gcc/ChangeLog
    branches/gcc-4_9-branch/gcc/tree-vectorizer.h

[Bug c/61271] 10 * possible coding error with logical not (!)

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61271

--- Comment #16 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Tue Aug 26 09:30:29 2014
New Revision: 214495

URL: https://gcc.gnu.org/viewcvs?rev=214495&root=gcc&view=rev
Log:
    PR c/61271
    * tree-vectorizer.h (LOOP_REQUIRES_VERSIONING_FOR_ALIGNMENT,
    LOOP_REQUIRES_VERSIONING_FOR_ALIAS): Wrap in parens.

Modified:
    branches/gcc-4_8-branch/gcc/ChangeLog
    branches/gcc-4_8-branch/gcc/tree-vectorizer.h

[Bug c/61271] 10 * possible coding error with logical not (!)

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61271

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
                 CC|                            |mpolacek at gcc dot gnu.org
           Assignee|unassigned at gcc dot gnu.org      |mpolacek at gcc dot gnu.org
   Target Milestone|---                         |5.0

[Bug c/61271] 10 * possible coding error with logical not (!)

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61271

--- Comment #17 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Tue Aug 26 09:35:10 2014
New Revision: 214496

URL: https://gcc.gnu.org/viewcvs?rev=214496&root=gcc&view=rev
Log:
    PR c/61271
    * expr.c (is_aligning_offset): Remove logical not.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/expr.c

[Bug c/61271] 10 * possible coding error with logical not (!)

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61271

--- Comment #18 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Tue Aug 26 14:24:15 2014
New Revision: 214523

URL: https://gcc.gnu.org/viewcvs?rev=214523&root=gcc&view=rev
Log:
    PR c/61271
    * sel-sched-ir.c (make_regions_from_the_rest): Fix condition.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/sel-sched-ir.c

[Bug c/61271] 10 * possible coding error with logical not (!)

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61271

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #19 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
All the issues mentioned in #c1 a #c2 are fixed.  What remains is now tracked
in PR62270 (Fortran FE).

[Bug c/61271] 10 * possible coding error with logical not (!)

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61271

--- Comment #20 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Mon Sep  1 10:07:05 2014
New Revision: 214782

URL: https://gcc.gnu.org/viewcvs?rev=214782&root=gcc&view=rev
Log:
    PR c/61271
    * cgraphunit.c (handle_alias_pairs): Fix condition.

Modified:
    branches/gcc-4_9-branch/gcc/ChangeLog
    branches/gcc-4_9-branch/gcc/cgraphunit.c

[Bug c/61271] 10 * possible coding error with logical not (!)

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61271

--- Comment #21 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Mon Sep  1 10:12:00 2014
New Revision: 214783

URL: https://gcc.gnu.org/viewcvs?rev=214783&root=gcc&view=rev
Log:
    PR c/61271
    * cgraphunit.c (handle_alias_pairs): Fix condition.

Modified:
    branches/gcc-4_8-branch/gcc/ChangeLog
    branches/gcc-4_8-branch/gcc/cgraphunit.c

[Bug c/61271] 10 * possible coding error with logical not (!)

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61271

--- Comment #22 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Mon Sep  1 10:14:22 2014
New Revision: 214784

URL: https://gcc.gnu.org/viewcvs?rev=214784&root=gcc&view=rev
Log:
    PR c/61271
    * expr.c (is_aligning_offset): Remove logical not.

Modified:
    branches/gcc-4_9-branch/gcc/ChangeLog
    branches/gcc-4_9-branch/gcc/expr.c

[Bug c/61271] 10 * possible coding error with logical not (!)

[mpolacek at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61271

--- Comment #23 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Mon Sep  1 10:16:43 2014
New Revision: 214785

URL: https://gcc.gnu.org/viewcvs?rev=214785&root=gcc&view=rev
Log:
    PR c/61271
    * expr.c (is_aligning_offset): Remove logical not.

Modified:
    branches/gcc-4_8-branch/gcc/ChangeLog
    branches/gcc-4_8-branch/gcc/expr.c